Creating a feature flag configuration profile in AWS AppConfig - AWS AppConfig
Understanding feature flag attributes

Creating a feature flag configuration profile in AWS AppConfig

You can use feature flags to enable or disable features within your applications or to configure different characteristics of your application features using flag attributes. AWS AppConfig stores feature flag configurations in the AWS AppConfig hosted configuration store in a feature flag format that contains data and metadata about your flags and the flag attributes.

Note

When you create a feature flag configuration profile, you can create a basic feature flag as part of the configuration profile workflow. AWS AppConfig also supports multi-variant feature flags. Multi-variant feature flags enable you to define a set of possible flag values to return for a request. When requesting a flag configured with variants, your application provides context that AWS AppConfig evaluates against a set of user-defined rules. Depending on the context specified in the request and the rules defined for the variant, AWS AppConfig returns different flag values to the application.

To create multi-variant feature flags, create a configuration profile first, and then edit any flags within the configuration profile to add variants. For more information, see Creating multi-variant feature flags.

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Understanding feature flag attributes

When you create a feature flag configuration profile—or create a new flag within an existing configuration profile—you can specify attributes and corresponding constraints for the flag. An attribute is a field that you associate with your feature flag to express properties related to your feature flag. Attributes are delivered to your application with your flag key and the enable or disable value of the flag.

Constraints ensure that any unexpected attribute values are not deployed to your application. The following image shows an example.

Example of flag attributes for an AWS AppConfig feature flag
Note

Note the following information about flag attributes.

  • For attribute names, the word "enabled" is reserved. You can't create a feature flag attribute called "enabled". There are no other reserved words.

  • The attributes of a feature flag are only included in the GetLatestConfiguration response if that flag is enabled.

  • Flag attribute keys for a given flag must be unique.

AWS AppConfig supports the following types of flag attributes and their corresponding constraints.

Type Constraint Description
String Regular Expression

Regex pattern for the string
Enum

List of acceptable values for the string
Number Minimum

Minimum numeric value for the attribute
Maximum

Maximum numeric value for the attribute
Boolean None None
String array Regular Expression Regex pattern for the elements of the array
Enum List of acceptable values for the elements of the array
Number array Minimum Minimum numeric value for the elements of the array
Maximum Maximum numeric value for the elements of the array